'\" t
.\"     Title: glBindFragDataLocation
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 01/03/2018
.\"    Manual: [FIXME: manual]
.\"    Source: [FIXME: source]
.\"  Language: English
.\"
.TH "GLBINDFRAGDATALOCATI" "3G" "01/03/2018" "[FIXME: source]" "[FIXME: manual]"
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.\" * MAIN CONTENT STARTS HERE *
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.SH "NAME"
glBindFragDataLocation \- bind a user\-defined varying out variable to a fragment shader color number
.SH "C SPECIFICATION"
.HP \w'void\ glBindFragDataLocation('u
.BI "void glBindFragDataLocation(GLuint\ " "program" ", GLuint\ " "colorNumber" ", const\ char\ *\ " "name" ");"
.SH "PARAMETERS"
.PP
\fIprogram\fR
.RS 4
The name of the program containing varying out variable whose binding to modify
.RE
.PP
\fIcolorNumber\fR
.RS 4
The color number to bind the user\-defined varying out variable to
.RE
.PP
\fIname\fR
.RS 4
The name of the user\-defined varying out variable whose binding to modify
.RE
.SH "DESCRIPTION"
.PP
\fBglBindFragDataLocation\fR
explicitly specifies the binding of the user\-defined varying out variable
\fIname\fR
to fragment shader color number
\fIcolorNumber\fR
for program
\fIprogram\fR\&. If
\fIname\fR
was bound previously, its assigned binding is replaced with
\fIcolorNumber\fR\&.
\fIname\fR
must be a null\-terminated string\&.
\fIcolorNumber\fR
must be less than
\fBGL_MAX_DRAW_BUFFERS\fR\&.
.PP
The bindings specified by
\fBglBindFragDataLocation\fR
have no effect until
\fIprogram\fR
is next linked\&. Bindings may be specified at any time after
\fIprogram\fR
has been created\&. Specifically, they may be specified before shader objects are attached to the program\&. Therefore, any name may be specified in
\fIname\fR, including a name that is never used as a varying out variable in any fragment shader object\&. Names beginning with
\fBgl_\fR
are reserved by the GL\&.
.PP
In addition to the errors generated by
\fBglBindFragDataLocation\fR, the program
\fIprogram\fR
will fail to link if:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
The number of active outputs is greater than the value
\fBGL_MAX_DRAW_BUFFERS\fR\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
More than one varying out variable is bound to the same color number\&.
.RE
.sp
.SH "NOTES"
.PP
Varying out varyings may have indexed locations assigned explicitly in the shader text using a
location
layout qualifier\&. If a shader statically assigns a location to a varying out variable in the shader text, that location is used and any location assigned with
\fBglBindFragDataLocation\fR
is ignored\&.
.SH "ERRORS"
.PP
\fBGL_INVALID_VALUE\fR
is generated if
\fIcolorNumber\fR
is greater than or equal to
\fBGL_MAX_DRAW_BUFFERS\fR\&.
.PP
\fBGL_INVALID_OPERATION\fR
is generated if
\fIname\fR
starts with the reserved
\fBgl_\fR
prefix\&.
.PP
\fBGL_INVALID_OPERATION\fR
is generated if
\fBprogram\fR
is not the name of a program object\&.
.SH "ASSOCIATED GETS"
.PP
\fBglGetFragDataLocation\fR()
with a valid program object and the the name of a user\-defined varying out variable
.SH "VERSION SUPPORT"
.TS
allbox tab(:);
lB cB s s s s s s s s s s s
lB cB cB cB cB cB cB cB cB cB cB cB cB.
T{

T}:T{
\fBOpenGL Version\fR
T}
T{
\fBFunction / Feature Name\fR
T}:T{
\fB2\&.0\fR
T}:T{
\fB2\&.1\fR
T}:T{
\fB3\&.0\fR
T}:T{
\fB3\&.1\fR
T}:T{
\fB3\&.2\fR
T}:T{
\fB3\&.3\fR
T}:T{
\fB4\&.0\fR
T}:T{
\fB4\&.1\fR
T}:T{
\fB4\&.2\fR
T}:T{
\fB4\&.3\fR
T}:T{
\fB4\&.4\fR
T}:T{
\fB4\&.5\fR
T}
.T&
l c c c c c c c c c c c c.
T{
\fBglBindFragDataLocation\fR
T}:T{
\-
T}:T{
\-
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}
.TE
.sp 1
.SH "SEE ALSO"
.PP
\fBglCreateProgram\fR(),
\fBglGetFragDataLocation\fR()
.SH "COPYRIGHT"
.PP
Copyright
\(co
2010\-2014 Khronos Group\&. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1\&.0, 8 June 1999\&.
\m[blue]\fBhttp://opencontent\&.org/openpub/\fR\m[]\&.
.SH "COPYRIGHT"
.br
Copyright \(co 2010-2014 Khronos Group
.br